Since the application only stores its current state, all historical information about previous states is gone. The state is always overwritten by the new updates.

This makes it hard to reproduce how an application got into its current state. If a current state was miscalculated from its originating use case invocations, there is no possibility of fixing the situation later on.

Some scenarios explicitly require reproducibility for legal terms. Some applications therefore include audit logs that permanently write certain information as soon as they happen to the system.